import math
import copy

n, x = [ int(v) for v in input().split(" ") ]
number_list = [ int(v) for v in input().split(" ") ]




sumlist = [ [ number_list[i] + number_list[j] for j in range(n) ] for i in range(n) ]


print( sum( [ sumlist[i].count(x) for i in range(n) ] ) )